The confluence of the Allegheny River (top) and Monongahela River (right) joining to form the Ohio River (left), in Pittsburgh. The exposure here was set to show the ice well, not to make a pretty picture of downtown. The rivers are icy because temperatures dropped to -10F the night before. Thanks to Jim Albright & Julia Lentcher for balcony access, and to David Bear for coordinating the photo shoot. For a prettier picture, see gigapan.com/gigapans/149078 . For more panoramas shot from this building (The Trimont), see gigapanorama.org